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References to 'Peano arithmetic'
1. $0\ne 1$ as real numbers by mps
2. $Z_2$ by Henry
3. axiom by rmilson
4. beyond formalism: G\"{o}del's incompleteness by gribskoff
5. Elementary Functional Arithmetic by Henry
6. example of a universal structure by uzeromay
7. example of antisymmetric by Algeboy
8. from Hilbert's tenth problem to G\"{o}del's trichotomy by gribskoff
9. Henri Poincar\'e by Daume
10. importance of primitive recursion by CWoo
11. motivation for von Neumann ordinals by yark
12. PA by Henry
13. pairing function by rspuzio
14. Presburger arithmetic by Henry
15. proof of recurrences for derangement numbers by rm50
16. rational numbers are real numbers by matte
17. recursively axiomatizable theory by mathcam
18. recursively enumerable by ariels